Order Rodentia - Family Cricetidae Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 2 955 1189 book chapter 0-8018-8221-4 10.5281/zenodo.7316535 Delomys Thomas 1917 Delomys Thomas 1917 , Ann. Mag. Nat. Hist., ser. 8, 20: 196 . Type Species: Hesperomys dorsalis Hensel 1873 Species and subspecies: 3 species: Species Delomys collinus Thomas 1917 Species Delomys dorsalis (Hensel 1873) Species Delomys sublineatus ( Thomas 1903 ) Discussion: Sigmodontinae incertae sedis . Delomys has variously stood as a genus ( Avila-Pires, 1960 c ; Gyldenstolpe, 1932 ; Tate, 1932 f ) or merged under Thomasomys , with or without subgeneric division ( Ellerman, 1941 ; Moojen, 1952 ; Osgood, 1933 d ). As remarked by Osgood (1933 d ) , Thomas in part created Delomys to taxonomically underscore the geographic disjunction between thomasomyines in SE Brazil and the diverse radiation of typical Thomasomys in the N Andes (e.g., see Reig, 1986 ). Defining morphological traits consolidated and contrasted with types species of Thomasomys and Oryzomys by Voss (1993); chromosomal variation reported by Zanchin et al. (1992 b ) and Bonvicino and Geise (1995) . While the morphological differentiation of Delomys is comparable to that of other sigmodontine genera, its cladistic stature with regard to Andean thomasomyines—and that of other SE Brazilian endemics like Juliomys , Rhagomys , Phaenomys , and Wilfredomys (oryzomyine-thomasomyine plesions sensu Voss, 1993 )—must await broader-based phylogenetic inquiry. In one such preliminary view using cytochrome b sequence data, Delomys erratically formed a basal clade with various other tribes depending upon the analysis ( Smith and Patton, 1999 ); those authors arranged the genus as one of several "additional unique lines." Number of recognized species given as four ( Moojen, 1952 ), three ( Bonvicino and Geise, 1995 ; Reig, 1986 ), two ( Ellerman, 1941 ; Gyldenstolpe, 1932 ; Hershkovitz, 1998 ; Voss, 1993), or one (Cabrera, 1961; Corbet and Hill, 1991 ; Honacki et al., 1982 ). The three recognized here integrates the revision of Voss (1993) and karyological results of Zanchin et al. (1992 b ) and Bonvicino et al. (1995) . Avila-Pires (1960 c ) associated Calomys plebejus Winge, 1887 , as another form of Delomys ; Voss (1993) accepted the generic assignment but regarded plebejus as a nomen dubium , considering its equivalence to any of the living species as indeterminate .